Water-tube boiler.



R. SCHULZ. WATER TUBE BOILER. APPLICATION FILED JAN. 4, 1910.

Patented Jan.23,1912.

COLUMBIA PLANOGRAP'H Cc., WASHINGTDNY D. c.

.v RICHARD SCHULZ; v,or BERLIN, enn'MANY.

WATER-TUBI: BCILER.

,Specificationl of Letters Patent. Application filed January 4," 1910. f Serial No. 536,374. y

` Patented Jan. 23, 19,12.

y*To all whom it may concern:

Be it known that I, RICHARD SCHULZ, a' subject of the Kingof Prussia, residing at 2 Flensburgerstrasse, Berlin, Germany,`have invented certain newand useful Improvements in VVater-Tube Boilers; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the vart yto which it appertains to make and' use the same, reference being had to the accompany- Ing drawings, and toy letters or v figures of which I place a superheater.

reference marked thereon, which form s a part of this specification.

My invention relates to water-tube boilers or boiler furnaces in which there are two or moresets of tubes or water legs in whichk or through which are formed'flues for the passage of furnace gases, the flue orl flues at one water legbeing connected to the flue or flues at the other water leg by a transverse Hue in I also provide a structure in which the quantity of furnace gases acting on the superheater may be controlled. l l

Referring to the drawings, in which like parts are similarly designated-Figure lis a diagrammatic view of a well known type of steam boiler furnace, having a flue connecting the flues at two lateral water legs, in which I have placed a superheater f. Fig. 2 is a simil'arview of a modification, in which I provide means to varythe quantity of furnace gases passing to the superheater. Fig. 3 is a vertical, longitudinal section of a steam boiler furnace embodying my invention. Fig. 4t is a vertical, transverse section of Fig. 3. Fig. 5 is a horizontal section of Fig. 3. Fig. 6 is a detail ysection of the valve controlling the by-pass taken on line 6-6 of Figs. 3 and '5. Fig. 7 lis a view similar to Figlt, showing a modied. form of the water legs. Fig.n 8 is a diagram ywith the superheater chamber and by-pass for a twin or double steam-boiler furnace."

Referring to Fig. 1fthef furnace4 gases generated on the grate enter, in the direction indicated by the arrows, at one end of the water leg or group of tubes 1, through which they flow horizontally4 from front to rear, ,then pass throughthe transversepassage to the other water leg or grou'pfof tubes 2, through which they, again flow horiontally from the'y rear to the front. The

gases then passent of thehgroupx ,oftubes 2Y tion of this type of .boiler having the trans-- to the chimney. Various forms of construc- I i verse passage w are-known, all of which are characterized by the passage m formingV the connection between the flues that are formed by thegroups oftubes or water legs bordering the furnace. These-constructions'differ from one another only'A bythe number and formation of the groups of `tubes and the ar;v rangement offlues'in and between the tubes.`

vThe: cross passage 'm in'such structures serves as a connection for guiding the furnace gases between vthe water legs,'but it 'mayyalso be f I formed asa combustion chamber. Now 'ac-` cordmg to n. this 1nvent1on,th1s transverse whichfreceives a superheater of 'any suitable u kind. In Fig. 1 this is' shown diagram.

matically as a spiral tube f around which the furnace gases,l passing through the transverse passage m low.

According to a 'modification of theiny passage isf enlarged to form a chamber,y f.

vention, which 4is Y. shown diagrammatically in plan view in Fig. 2, a connecting passage or by-pass y is provided in addition to the transverse-passage ,m which receives they sIi.-.

perheater, ff This passage y is of such dipassage may alsobe enlarged by removing some ofthe 'bricks of` this cross-walls the superheat'ingrv is too strong. Finally, a clos-,

-ing `deviceor damper,lfor instance a vertically movabledamper, may also be arranged in the connecting passage yV to control the passage ofthe furnace gases .throughthetl L xmensions that onlyV a portion of the furnace j' gases How through it y'from one group of superheater chamber f. When this damper isclosed, all thefurnace gases coming from the group of tubes or water -leg lfar'e forced to flow through the. chamber m and superheater f in the `directionshown by the arrows in 'full lines, in order toreach the v,group of tubes onwater leg If,however,

the damper in the connecting passage y be opened, a portion of the furnace gasespasses directly, as indicated by the dotted arrows` through the passage y from the group of tubes 1 to the group of tubes 2.

This construction of a water-tube boiler with attached superheater is shown in Figs. 3 5, in two vertical sections and a horizontal section. The boiler proper is of the known type previously described, and consists of an upper drum o, two lower drums u, and

two groups of tubes 1 and 2 which connect the upper drum with the lower drums forming the water legs and inclose a space r between them in which the flame can develop. The outer and inner rows of tubes of the groups of tubes 1 and 2 consist of tubes arranged closely side by side, in which, however, are openings at certain places, as customary through which the furnace gases can enter or escape from the groups of tubes. Of course the furnace gases may also pass several times through the group of tubes. At the rear of the boiler is the chamber forming the cross passage, with the superheater f therein, and a connecting passage or by-pass y is provided. The superheater f here consists of vertical tubes, but may be of any suitable construction. A transverse wall s is provided in the by-pass y, which wall extends downward from the top to half the height of the passage, as

n -shown in Fig. 6. A vertically movable damper .e lmay bearranged before or behind this wall s. l/Vhen the boiler is tired. the damper e is drawn up, so that the gases from ythe group of tubes 1 can directly reach the group of tubes 2 through the passage y, as indicated by the dotted arrows, and only a small portion of the furnace gases, or even none at all, fiow through the superheater chamber If, however, the damper a be entirely closed, all the furnace gases are forced to flow through the superheater chamber Fromv this construction it results that the damper a lnay also be utilized for regulating within the widest limits the superheating of the steam. Then the damper e is closed, it is evident that the strongest super-heating will take place. and

according' as the damper e is opened more or less, a larger or smaller portion of the furnace gases will flow through the connecting passage y without reaching thesuperheater chamber m. The cross wall s may'also be the full height of the passage y,

and then be provided with special apertures. In the latter case the damper z may also be f. formed as a grating or lattice-work slide.

-Arrangements for conveying the furnace gases through closing devices or dampers 1n such a way that they flow, more or less,

through a superheater connected with the.

(-boiler are in themselves known, but they mostly' consist of rotatable valves. Such arrangements are very liable to destruction by the heated surface gases. The described arrangement of the connecting passage i/ with the damper e, movable vertically up and down, has, however, the advantage that the damper, where it comes in contact with the furnace gases, may be entirely made of fire-proof material. The handling of the damper by means of a chain pull is also very simple, and, finally, the damper may be easily adjusted to any suitable height. The connecting passage 1/ with the damper .e thus allows of the working of the boiler being adapted to any requirement as regards superheating.

The two groups of tubes l and 2 may be of equal or of different size, so that if, for instance, a high superheating is desired, the group of tubes 1 is made smaller than the group of tubes 2, more tubes being inserted in the latter than in group 1, that is to say, the tubes are arranged farther apart, so that the furnace gases here encounter less resistance than in the group of tubes 2. The form of the tubes is immaterial; they may be straight or curved, as shown, for instance, in Fig. 7 The lower drums u may even be omitted, and the tubes of the groups 1 and 2 may then, for instance, be formed as field tubes or U-shaped tubes.

The superheater may also be heated from two or more furnaces, as shown diagrammatically in Fig. 8, for instance. This tigure represents a plan view of a boiler having two furnaces and three groups of tubes. The furnace gases first flow through the central group of tubes 1, and may then reach the side groups of tubes 2 either through the chamber wit-h the superheater f or through the two connecting passages 7/ with or without cross walls or dalnpers 2, as is indicated by the arrows in full lines and dotted lines, respectively. A central wall may, however, be provided in the group of tubes 1, and accordingly also the chamber a' may be divided and two separate superheaters provided.

If the boiler is to be employed for marine purposes, a sheet-metal casing is. employed in place of the masonry shown in Figs. 3 to 6.

In place of the chain grate shown in Figs. 3 and 4f, any other suitable grate construction may of course be employed.

I claim- 1. A watertube boiler having two or more groups of tubes through which the furnace gases pass substantially horizontally, a horizontal passage at the rear of said groups of tubes through which the furnace gases pass from one group of tubes to another, a superheater in said passage, a horizontal by-pass from one group of tubes tothe other, both passage and by-pass connecting the ends of the passages through the groups of tubes passing through the super-heater Whiley maintaining the lengths of the paths through the passage and by-path substantially the Same.

2. A Water tube boiler having tvvo or r'more groups of tubes through Which the furnace gases pass substantially horizontally, `a transverse passage at the rear of said groups of tubes through which the furnace gases pass from one group of tubes to another, a

by-pass from one group oftubes to the other and at the same level and means to control Y the passage of gasesfthrough the by-pass f' another also at the same level as the passages through the groups of tubes and a Wall eX- tending across and partially closing the bypass, therebyinaintainingv the lengths of the paths of the "gases through the passage and bypass substantially the same;

4. A watentube boiler having tvvo or more,

groups of tubes, a transverse passage at Ithe rear of said groups of tubes through which the furnace gases pass from theend of one group of tubes to the end 'of another, a

superheater in said passage, a transverse bypass from one group of tubes to another, said passage and by-pass at the same levelas the passages through said groups of tubes separated by a Wall and a Wall extending across and partially closing the by-pas's, y y thereby maintainingthe lengths of the paths Copies of this patent ymay ,be `obtained. for

a horizontal passage orf theV gases through said passage andby` pass substantially the same.

"5. 'A Water-tube boiler having tvvo or more f groups of tubes, a horizontal passage at the 'rear of said 4groups of tubes through which the furnace 'gases pass from 'one group of tubes to`another, a^ superheater in saidxv pas?)4 sage, a horizontal by'passr for gases, said horizontallpassage and bypass at the saine level as the passagesthrough said groups of tubes, a-Wfall extendingy across and partially closing the byrpass and a valve cooperating with the Wall. f f superheaterL in said passage, La`transverse j 6. A Water-tube boilerV having tivo or more groups of tubes, a horizontal passage atthe rear of said groups of tubes through which tubes to another, a superheater inthe passage, afhorizontal by-pass, saidchorizontal passage and .bypass at the same level aslthe passages through said groups of tubes, substantiallyv vertical Wall extending across and partially closing theby-pass, and kavertically movable' fire-proof valve tcoperating with the Wall. s

7. Avvatentube boiler having tvvo 'or Inore groupspf tubes, a transversekpassagen` at the rear of said groups of 'tubesnthrough :which the furnace gases pass froin one groupy of ytubes to another, a parallel transverse bythe furnace `gases pass from one. group of passbetvveen the saine groups oftubes, both the transverse passage and the by-pass.at

substantially the same level as the passages through`said groups of tubes, a Wall ,sepa-` rating said Epassage and'by-pass, and a slide Y jvalve oflire-prooflnaterial to control the volume off gases passing through the bypass.` y* Aj x l .r

In testimony that 'I olairny the foregoing as Iny invention, I havefsigned my name `iny presence of tvvo subscribing Witnesses.

Witnesses:

JOHANNES HEIN, VVVOLDEMAR HAUPT.

five cents each, addressing' the Comxiiissioner of Patents, Washington, D. C. l

f RICHARD soHLzs; 

